I've had cars that were 15+ years old and I've never replaced a brake line. About a month ago, a woman at work had to replace a corroded brake line on her '01 Taurus. Today, I replace a brake line on my '01 LeSabre. This is in CT where there is snow and the roads are salted so corrosion does happen. Just that I've never encountered replacing a line in 47 years of owning cars and now I know of two in a short time.
Common problem?